I have a custom storage engine (`aws-sdk`) which uploads to an S3 bucket (it is similar to the core S3 storage engine but it uses the [[https://aws.amazon.com/sdk-for-php/ | AWS SDK]] and thus supports IAM credentials (see T5155).
My configuration is as follows:
{F878726, size=full}
My goal is that all files are written to S3 instead of MySQL, but I'm not entirely sure how to disable the MySQL storage engine.